Patrick McHardy wrote:
> Ingo Molnar wrote:
> 
>>* Anant Nitya <kernel@prachanda.info> wrote:
>>
>>>I am posting links to the information you asked for. One more thing, 
>>>after digging a bit more I found its QoS shaping that is making the 
>>>box crawl. Once I disabled the traffic shaping everything comes back 
>>>to smooth and normal. Shaping being done on very low speed residential 
>>>ADSL 256/64 Kbps connection. If you want me to post shaping rules, 
>>>please free to ask. BTW its a simple HTB/SFQ rules.
>>
>>[...]
>>
>>
>>>http://cybertek.info/taitai/trace-to-ingo.txt.bz2
>>
>>
>>thanks! This trace indeed includes the smoking gun, htb_dequeue() and 
>>__qdisc_run():
>>
>>[..]
> 
> This looks like fallout from the switch to hrtimers. Anant, please
> send me your HTB script, I'll try to reproduce it.


I think I already found the bug, please try if this patch helps.